I was walking north in London. I was definitely walking north. My phone map showed I was going north. The road signs pointed straight ahead to go to Kings Cross, which was to the north. I knew I going north. But, in a post-apocalyptic way, I also like trying to navigate by using the sun. It was afternoon. The sun would be setting in the west. I was heading north. Shadows would stretch out to my right. I looked at the shadows on the ground. They were stretching out to the left. Left, not right. Wrong. I stopped dead, now completely unsure which direction I was going and what part of my reasoning chain was broken.
It took me a while, but I figured it out. There were tall buildings to my left blocking the direct sun. On my right was tall glass-fronted offices. The windows were bouncing sunlight from up high down onto the pavement. From the “wrong” direction!
Moral of the story: don’t trust the sun!